Wally Darling x F!reader (cover art not mine!)

You just moved out of your toxic families home and the only person who knows where you moved is your 16 year old sister. you only told her in case she wanted to visit you when she got her license. for the sake of this book Wally will be 5'6 still short but not 3'0 like his canon self. your not really on the tall side yourself, your 5'2. When you meet Wally and the others you start to notice him getting.. jealous?